I am presently repairing an ICOM IC735 which has not been used for about 7 years.The circuit boards appeared in good condition when I examined them,but
when the power was switched on the 3 amp fuse was blown.I tested the finals,predriver and driver transistors,diodes and electrolytic capacitors in the power
amp circuits and they all tested good.Can anyone offer any help to solve this problem?

Go to IC10 on the PL Unit and check pin 8 to ground. If there is a short it could be C18 or C247.

Same procedure for all of the boards - check the 13.8V line to all boards and check all caps to
ground and see if there is a short in any of them. You may have to remove them individually
to confirm they are or are not shorted.